提高某航天产品局部刚度的仿真研究

Simulation Study on Improving Local Stiffness of a Certain Space Unit

目的采用计算机仿真的方法,对某航天产品结构的动态特性进行研究,并提出提高该产品局部刚度的修改设计方案。方法用MSC.Patran对产品结构建立有限元模型,用MSC.Nastran计算产品结构的固有振动模态,结合实际振动试验结果,验证了仿真计算的准确性。结果分析产品结构耐航天振动环境的能力,在满足产品功能要求的前提下,提出两个可行的提高局部刚度的修改设计方案,通过对两个修改结构方案进行仿真计算,对修改后的结构动态特性进行了预测。结论提高某航天产品局部刚度的仿真研究,为该产品的修改设计提供了理论指导,这一技术方法可作为航天产品耐振动环境设计的技术手段。

Objective To investigate the dynamic characteristics of a certain space unit and propose a modified plan to improve the local stiffness of space unit with computer simulation.Methods The MSC.Patran was used to create the finite element model（FEM） of the space unit,and MSC.Nastran to compute its mode shapes.The method＇s validity was verified by comparing the simulation results with the actual vibration test results.Results The space unit endurance ability to space vibration environment was discussed.Two practicable modified plans were provided in order to improve the local stiffness of space unit in the case of the function of the space unit fulfilling its requirements.The dynamic characteristics of the two modified structures were predicted with the same numerical simulation program.Conclusion The simulation study method for improving local stiffness of a space unit can offer the theoretical reference for structure modification of the space unit.This technique can be applied to space unit endurance design to vibration environment.